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---
title: CSS
slug: Glossary/CSS
tags:
- CSS
- CodingScripting
- Glossary
- Komut Dosyası
- Sözlük
- Web
- 'l10n:priority'
- oncelik
translation_of: Glossary/CSS
---
<p><span class="seoSummary"><strong>CSS</strong> (Cascading Style Sheets) is a declarative language that controls how webpages look in the {{glossary("browser")}}.</span> The browser applies CSS style declarations to selected elements to display them properly. A style declaration contains the properties and their values, which determine how a webpage looks.</p>
<p>CSS is one of the three core Web technologies, along with {{Glossary("HTML")}} and {{Glossary("JavaScript")}}. CSS usually styles {{Glossary("Element","HTML elements")}}, but can be also used with other markup languages like {{Glossary("SVG")}} or {{Glossary("XML")}}.</p>
<p>A CSS rule is a set of {{Glossary("CSS Property","properties")}} associated with a {{Glossary("CSS selector", "selector")}}. Here is an example that makes every HTML paragraph yellow against a black background:</p>
<pre class="brush: css notranslate">/* The selector "p" indicates that all paragraphs in the document will be affected by that rule */
p {
/* The "color" property defines the text color, in this case yellow. */
color: yellow;
/* The "background-color" property defines the background color, in this case black. */
background-color: black
}</pre>
<p>"Cascading" refers to the rules that govern how selectors are prioritized to change a page's appearance. This is a very important feature, since a complex website can have thousands of CSS rules.</p>
<h2 id="Learn_more">Learn more</h2>
<h3 id="General_knowledge">General knowledge</h3>
<ul>
<li><a href="https://developer.mozilla.org/en-US/Learn/CSS">Learn CSS</a></li>
<li>{{interwiki("wikipedia", "CSS")}} on Wikipedia</li>
</ul>
<h3 id="Technical_reference">Technical reference</h3>
<ul>
<li><a href="/en-US/docs/Web/CSS">The CSS documentation on MDN</a></li>
<li><a href="http://www.w3.org/Style/CSS/current-work" rel="external">The CSS Working Group current work</a></li>
</ul>
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